Lewis Structures

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Which of the following is the correct Lewis structure for formaldehyde, CH₂O?
Which of the following is the correct Lewis structure for ethene (ethylene), C₂H₄?
Which of the following elements will NOT be surrounded by an octet of electrons in a correctly drawn Lewis structure?
1. Chlorine
2. Hydrogen
3. Oxygen
4. Carbon
Which of the following is NOT a valid Lewis structure?
The seven elements that occur as diatomic elements are:
1. Fe₂, Rn₂, O₂, He₂, Ne₂, C₂, Br₂
2. H₂, N₂, O₂, He₂, Ne₂, C₂, Na₂
3. H₂, N₂, O₂, He₂, Ne₂, Cl₂, Br₂
4. H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂
Which of the following is the correct Lewis structure for methanol, CH₄O?
In drawing Lewis structures, a single line (single bond) between two elements represents:
1. an unshared pair of electrons
2. a shared pair of electrons
3. an octet of electrons
4. a shared electron
Which of the following is an acceptable Lewis structure for chloromethane (CH₃Cl)?
Which of the diatomic elements has a double bond between its atoms?
1. nitrogen
2. oxygen
3. hydrogen
4. flourine
Which of the following is the correct Lewis structure for phosphorus tribromide, PBr₃?
According to the HONC rule, how many covalent bonds form around nitrogen?
According to the HONC rule, how many covalent bonds form around carbon?
In the correct Lewis structure for water, how many unshared pairs of electrons will oxygen have?
1. 4
2. 2
3. 1
4. 3
Which of the following is a correct Lewis structure for hydrogen cyanide, HCN?
The octet rule explains the stability of most covalently bonded molecules in terms of:
1. electron affinities
2. electronegativity differences
3. noble-gas configurations
4. ionization energies
Which of the following is an acceptable Lewis Structure for the diatomic nitrogen molecule?
According to the HONC rule, how many covalent bonds form around oxygen?
According to the HONC rule, how many covalent bonds form around hydrogen and the halogens?
Which of the following is the correct Lewis structure for ammonia, NH₃?
In the correct Lewis structure for the methane (CH₄) molecule, how many unshared electron pairs surround the carbon?
1. 2
2. 4
3. 8
4. 0